\\[-1.8ex] Soil Heterogeneity & $-$0.381$^{***}$ & $-$0.310$^{***}$ & $-$0.308$^{***}$ & $-$0.250$^{**}$ & $-$0.346$^{***}$ & $-$0.193$^{*}$ \\ 
  & (0.119) & (0.114) & (0.112) & (0.105) & (0.113) & (0.103) \\ 
\\[-1.8ex] 
Observations & 11,892 & 11,892 & 11,892 & 11,892 & 11,892 & 11,892 \\ 
R$^{2}$ & 0.419 & 0.437 & 0.436 & 0.445 & 0.427 & 0.460 \\ 
